دانلود مقاله isi فرسودگى در اثر اصطکاک اتصالات جوش


دانلود رایگان مقاله الزویر درباره شروع فرسودگى در اثر اصطکاک اتصالات جوش در AA2024 – T3 (کلیک کنید)


 

توضیحات

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مشخصات این مقاله :

عنوان مقاله :

Fatigue initiation behaviour throughout friction stir welded joints in AA2024-T3

ترجمه فارسی عنوان :

شروع وضع فرسودگى در سراسر فعالیت اصطکاکی اتصالات جوش داده شده در AA2024 – T3

سال انتشار : 2010

متعلق به مجله یا ژورنال : بین المللی فرسودگى (International Journal of Fatigue)

فرمت: PDF

تعداد صفحات: 9

شماره پروژه: 5005


کلمات کلیدی :

Friction stir welding, Fatigue initiation, Modified Goodman relation, Residual stress, Numerical analysis

جوشکاری اصطکاکی اغتشاشی، شروع فرسودگى، ارتباط اصلاح شده گودمن، تنش پسماند، آنالیز عددی


چکیده  انگلیسی مقاله فرسودگى در اثر اصطکاک اتصالات جوش :

Abstract

This paper presents the results of an experimental and numerical investigation on the fatigue crack initiation behaviour of friction stir welded joints in AA2024-T3. These welds exhibit a complex material behaviour. In this study the influence of the different weld zones on the fatigue crack initiation behaviour was investigated. Therefore, fatigue experiments were conducted on a variety of welded central notched specimen configurations. As a result, the fatigue initiation life as function of the location in and the orientation of the weld was obtained. Numerical analyses were performed to investigate the influence of residual stress and yield strength on the stresses at the notch.


مقدمه مقاله فرسودگى در اثر اصطکاک اتصالات جوش :

 Introduction

Friction Stir (FS) welding attracts a growing interest as a high potential joining technology for aerospace applications [1,2]. Welding can offer a reduction in production costs and structural weight [3]. FS welding is a solid-state process, which makes it possible to join high strength aluminium alloys such as AA2024 and AA7075 [4]. The low process temperatures below solidus temperature assure a small heat impact with a good preservation of strength [5]. Furthermore, FS welding of aluminium alloys is a robust process without emission of hazardous gasses or radiation which requires protection. To use FS welding in an airworthy structure, the fatigue behaviour and more specific Fatigue Initiation (FI) must be fully understood. Due to the often applied initial flaw approach, the reported research on FS welding in the literature, is mainly focussed on residual strength and Fatigue Crack Growth (FCG). In addition, most FI experiments are performed on commonly used dog-bone specimens (with Kt near 1), with the weld perpendicular to the applied load. These specimens will only result in the FI behaviour of the ‘weakest’ location in the weld, because there initiation will occur first. These dog-bone specimens do not include the effect of residual stresses, because the size is often too small for the residual stress to be maintained. By using centre notched FI specimens, the notch can be positioned at the location in the weld from which the FI life is desired. Moreover, a specimens width of 50 mm is large enough to maintain the residual stresses.


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دانلود رایگان مقاله الزویر درباره شروع فرسودگى در اثر اصطکاک اتصالات جوش در AA2024 – T3 (کلیک کنید)


 

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